<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="提交审核"/>
    </el-steps>

    <el-button type="text" @click="dialogChapterFormVisible = true">添加章节</el-button>
    <!-- 显示 章节 开始 -->
    <ul class="chanpterList">
        <li
            v-for="chapter in chapterList"
            :key="chapter.id">
            <p>
                {{ chapter.title }}
                <span class="acts">
                    <el-button type="text"  @click="dialogVideoFormVisible = true; chapterId = chapter.id">添加小节</el-button>
                    <el-button type="text" @click="editChapter(chapter.id)">编辑章节</el-button>
                    <el-button type="text" @click="removeChapter(chapter.id)">删除章节</el-button>
                </span>
            </p>

            <!-- 小节 -->
            <ul class="chanpterList videoList">
                <li
                    v-for="video in chapter.children"
                    :key="video.id">
                    <p>{{ video.title }}
                        <span class="acts">
                            <el-button type="text" @click="editVideo(video.id)">编辑</el-button>
                            <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                        </span>
                    </p>
                </li>
            </ul>
        </li>
    </ul>
    <!-- 显示 章节 结束 -->

    <el-form label-width="120px">
      <el-form-item>
        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
      </el-form-item>
    </el-form>

  <!-- 添加与修改章节弹出框 开始-->
  <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
    <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
            <el-input v-model="chapter.title"/>
        </el-form-item>
        <el-form-item label="章节排序">
            <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
        </el-form-item>
    </el-form>
    <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
    </div>
  </el-dialog>
  <!-- 添加与修改章节弹出框 结束-->

  <!-- 添加和修改课时(小节)弹出框 开始 -->
  <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
    <el-form :model="video" label-width="120px">
      <el-form-item label="课时标题">
        <el-input v-model="video.title"/>
      </el-form-item>
      <el-form-item label="课时排序">
        <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
      </el-form-item>
      <el-form-item label="是否免费">
        <el-radio-group v-model="video.free">
          <el-radio :label="true">免费</el-radio>
          <el-radio :label="false">默认</el-radio>
        </el-radio-group>
      </el-form-item>

      <el-form-item label="上传视频">
        <el-upload
              :on-success="handleVodUploadSuccess"
              :on-remove="handleVodRemove"
              :before-remove="beforeVodRemove"
              :on-exceed="handleUploadExceed"
              :file-list="fileList"
              :action="BASE_API+'/eduvod/video/uploadVideo'"
              :limit="1"
              class="upload-demo">
        <el-button size="small" type="primary">上传视频</el-button>
        <el-tooltip placement="right-end">
            <div slot="content">最大支持1G，<br>
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
            <i class="el-icon-question"/>
        </el-tooltip>
        </el-upload>
    </el-form-item>

    </el-form>
    <div slot="footer" class="dialog-footer">
      <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
      <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
    </div>
  </el-dialog>
  <!-- 添加和修改课时(小节)弹出框 结束 -->
  </div>
</template>

<script>
import chapterApi from '@/api/edu/chapter'
import videoApi from '@/api/edu/video'
import vodAPi from '@/api/edu/vod'
export default {
  data() {
    return {
      dialogChapterFormVisible: false, //是否显示章节表单
      chapter: {// 章节对象
        courseId:'',
        title: '',
        sort: 0
      },
      courseId:'', //课程id
      chapterList:[],// 章节嵌套课时列表
      saveBtnDisabled: false, // 保存按钮是否禁用

      saveVideoBtnDisabled: false, // 课时按钮是否禁用
      dialogVideoFormVisible: false, // 是否显示课时表单
      chapterId: '', // 课时所在的章节id
      video: {// 课时对象
        title: '',
        sort: 0,
        free: 0,
        videoSourceId: '', // 视频id
        videoOriginalName: '' //视频名称
      },
      fileList:[],
      BASE_API:process.env.BASE_API // 接口API地址
    }
  },

  created() {
    // 判断路由上是否存在id
    if(this.$route.params && this.$route.params.id){
      this.courseId = this.$route.params.id
      this.getChapterListByCourseId()
    }
  },

  methods: {

    //**********************************************视频 开始*************************************************** *//
    // 视频上传成功回调的方法
    handleVodUploadSuccess(response, file, fileList){
      this.video.videoSourceId = response.data.videoId 
      this.video.videoOriginalName = file.name
    },
    //视图上传多于一个视频
    handleUploadExceed(files, fileList) {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },
    // 删除视频之前
    beforeVodRemove(file, fileList){
       return this.$confirm(`确定移除 ${file.name}？`)
    },
    // 点击确定删除后，执行的删除功能
    handleVodRemove(file, fileList){
      console.log(this.fileList)
      vodAPi.deleteVideo(this.video.videoSourceId).then(res => {
        this.$message({
          type: 'success',
          message: "删除视频成功"
        })
        this.video.videoSourceId = ''
        this.video.videoOriginalName = ''
        this.fileList = []
      }).catch((res) => {
        this.$message({
          type: 'error',
          message: "删除视频失败"
        })
      })
    },

    //**********************************************视频 结束*************************************************** *//

    //**********************************************小节 开始*************************************************** *//
      // 删除小节
      removeVideo(videoId){
          this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          return videoApi.removeById(videoId)
        }).then(() => {
          this.getChapterListByCourseId()// 刷新列表
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
        }).catch((response) => { // 失败
          if (response === 'cancel') {
            this.$message({
              type: 'info',
              message: '已取消删除'
            })
          }
        })
      },

      // 添加小节
      saveDataVideo(){
        this.video.courseId = this.courseId
        this.video.chapterId = this.chapterId
        videoApi.saveVideoInfo(this.video).then(res => {
          this.$message({
            type: 'success',
            message: '添加课程小节成功!'
          })
          this.helpSaveVideo()
        })
      },

      // 修改前弹窗，并把数据显示在弹窗上
      editVideo(videoId){
        this.dialogVideoFormVisible = true //显示课时表单
        // 把数据填充到表单
        videoApi.getVideoInfoById(videoId).then(res => {
          this.video = res.data.videoVo
          if(this.video.videoOriginalName != ''){
            this.fileList = [{'name': this.video.videoOriginalName}] //弹窗时，把视频的名称显示在修改窗口
          }
        })
      },

      // 修改小节---修改小节需要先弹出修改框
      updateDataVideo(){
        videoApi.updateVideoInfoById(this.video).then(res => {
          this.$message({
            type: 'success',
            message: '修改成功!'
          })
          this.helpSaveVideo()
        })
      },
      // 添加修改小节公用方法
      helpSaveVideo(){
        this.dialogVideoFormVisible = false// 如果保存成功则关闭对话框
        this.getChapterListByCourseId()// 刷新列表
        this.chapter = '' //清空章节对象
        this.video.title = ''// 重置章节标题
        this.video.sort = 0// 重置章节标题
        this.video.videoSourceId = ''// 重置视频资源id
        this.saveVideoBtnDisabled = false
      },

      // 添加或修改小节（课程）
      saveOrUpdateVideo(){
        this.saveVideoBtnDisabled = true
        if(!this.video.id){
          this.saveDataVideo()
        }else{
          this.updateDataVideo()
        }
      },

    //**********************************************小节 结束*************************************************** *//
    
    //**********************************************章节 开始*************************************************** *//
    // 删除章节
    removeChapter(chapterId) {
      this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        return chapterApi.removeById(chapterId)
      }).then(() => {
        this.getChapterListByCourseId()// 刷新列表
        this.$message({
          type: 'success',
          message: '删除成功!'
        })
      }).catch((response) => { // 失败
        if (response === 'cancel') {
          this.$message({
            type: 'info',
            message: '已取消删除'
          })
        } else {
          this.$message({
            type: 'error',
            message: "删除失败"
          })
        }
      })
    },

    // 编辑章节信息--表格回显数据
    editChapter(chapterId){
      this.dialogChapterFormVisible = true //添加与修改表单弹出
      chapterApi.getById(chapterId).then(res => {
        this.chapter = res.data.eduChapter
      })
    },

    // 修改章节信息
    updateChapter(){
      chapterApi.updateById(this.chapter).then(res => {
         this.$message({
          type: 'success',
          message: '修改成功!'
        })
         this.helpSave()
      }).catch((response) => {
        this.$message({
          type: 'error',
          message: "修改失败"
        })
      })
    },


    // 添加章节
    saveChapter(){
      this.chapter.courseId = this.courseId
      chapterApi.save(this.chapter).then(res => {
        this.$message({
          type: 'success',
          message: '保存成功!'
        })
        this.helpSave()
      })
    },

    // 保存成功后的变化
    helpSave(){
      this.dialogChapterFormVisible = false// 如果保存成功则关闭对话框
      this.getChapterListByCourseId()// 刷新列表
      this.chapter.title = ''// 重置章节标题
      this.chapter.sort = 0// 重置章节标题
      this.saveBtnDisabled = false
    },

    // 保存或修改
    saveOrUpdate(){
      this.saveBtnDisabled = true //禁用下一步
      if(!this.chapter.id){ //判断该id是否存在，如果不存在，就是保存操作
        this.saveChapter() 
      }else{
        this.updateChapter() //修改操作
      }
    },

    // 根据课程id获取章节与小节
    getChapterListByCourseId(){
      chapterApi.getChapterVideoByCourseId(this.courseId).then(res => {
        this.chapterList = res.data.items
      })
    },

    // 上一节
    previous() {
      this.$router.push({ path: '/course/cinfo/'+this.courseId })
    },

    // 下一节
    next() {
      this.$router.push({ path: '/course/publish/'+this.courseId })
    }
    //**********************************************章节 结束*************************************************** *//
  }
}
</script>
<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
 .chanpterList li{
  position: relative;
}
.chanpterList p{
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%; 
  border: 1px solid #DDD;
} 
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}

</style>